Certificate of correction



June 13, 1933. E. A. KOHN COFFEE MAKING APPARATUS Filed July 3, 1951 INVENTOR BY 4; ATTORNEYZ 2 tion which, in operation, will utilize what for coffee mal'ring apparatus w'herebythe 55 i 50 trapped under the charge ofwater suddenly equalizer and vent. This element inthe il- Patented June 13, 1933 a v a 1,913,398

UNITEDZSTATES PATENT OFFICE Application filedJiily 3; 1931. Serial No. 548,504.

Thepresent invention relates to an irnerupts and causes overflow,not only of the provenient in coifee making apparatus. One water, but also of the ground coffee. v object thereof has been to provide a coffee A further object of my invention has been making device of relatively simple constructo provide a combined flow equalizer and vent has been recognized as the proper principle charge of heatcdwater is evenly distributed to be employed in the making of coffee bcv over and fed to the supply of finely ground erage from the coffee bean. One important coffee below, and whereby air entrapped uri factor in producing a coffee beverage of deder the equalizing device is permitted to essirablequality is the operation of leaching cape through a suitableventor conduit, and out the aromatic flavoring or essential oils of whereby dislodged or erupted coffee is also a th ground coff without, di lod ing vented and returned to the container without leaching undesirable components which are d sturblng or stopplng the flow or continued perceptible in the beverage by reason of th i distributlon of the heated water, or otherwise a 15 relatively bitter taste. In general, this r interfering with the contemplated operation sult is achieved by pouring water of ap- 0f the ppa a us. y y a proximately boiling temperature overa supp f r d f rmof apparatus embodying ply of finely ground coffee and in such promy lnventlon 1s illustrated 1n the drawing portions that the heated water willi'leaeh accompanylng the present application and in 29 through the coffee and be discharged within eh a space of approximately two minutes. This igur 1 16 a Central vertical section; is generally referred to as the drip proe- Figure 2, a transverse section on the line ess. An object of the present invention has 2 Of Flgure 1, and been to provide a simplified mechanism for 1gure 3, a transverse section on the hne 25 making drip coffee and for insuringthe qual- 0f Elgure l. L 1 l a ity of the results,assuming that a properly Referring to the drawlng, whereln a prer u d ff i vid d ferred form of my mproved coffee making I i k w th fl h b ade i apparatus is shown 1n operative relation to a p t i whi h th r d fi' is coifeebeverage pot or holder, said apparatus o t d on 0 ithi f i mb r includes a contalner having a perforated botsuch as a sieve, strainer, fabric bag or the like; 1 9 W and m v ble combined flow However, there is frequently an undesirable eq fi e and V I P luustlated m" delay in the passage of th h t d t lJOCllInGIlbtl'lB containerincludes.aseparate through the ground 'fi' Whflein other bottom membe1"prov1ded with abottom wall r; cases the water passes tooirapidlythrough a i p en t rr w 1 the groundcoflee or through only a portion by annular flange e? 13 at thereof, 3 t full flavoring Value of 'tached at any sultable place, as to the annuthe ground coffee supply is not utilized. Acflange icontamer includes cording to my invention,it is contemplated Slide W l membet r i b e 5 1" e5 that when" the heated water ispoured into 0 a glass m or h hke p i to fit v the coffee making apparatus with a r0 er snugly t opemng h annular fl g a a i p 2and to rest upon the upper surface of the pp y finely ground coffee the/rem e bottom wall and surrounding the'perforated a h ng efiectlof h W t w b u f m "portion 1. The bottom wall maybe formed 4e elu h ll Supply f in any suitable manner, preferably so'asto fee; and means are provided QQPf Pl fit readily upon thetop edge of a cup or c ofi'ee escape of air from belowthe vicinity of the t 5 J i i g l P S RPW- P B Yk My improved coffee making apparatus also dBVICGSQ t sOme pp i that 1 includes whatI designate as a combined flow lustrated form includes a removable tube or conduit 6 having an inlet opening 7 and an outlet opening 8, said opening 7 being spaced from the lower end of the tube 6. The latter is provided with a bottom supporting member or foot 9 adapted to rest upon a leveled supply of ground coffee 10 which, in operation of the device, rests loosely upon the upper surface of the perforated portion 1. The tube 6 carries a baffle or apron 11, arranged just above the opening 7 and adapted to facilitate the passage of air, water, and/or ground coffee through the vent tube under varying conditions of operation. The tube 6 also carries a flow equalizing member including a perforated plate 12 or the like arranged to move vertically in relation to the tube 6 along with a spacing collar 13 slidably mounted on the tube, above the upper surface of the apron 11. upward movement of the perforated equalizer plate 12, a suitable stop device is provided, shown in Figure 1 as an annular protruding ridge 14, in the tube 6.

In operation, the bottom member of my apparatus is seated on a cup or other suitable container for coffee beverage. If desired a filter paper 15 is laid over the perforated portion 1. The upright portion 4, preferably of glass, is placed in operative position with its lower edge portion resting upon the bottom member as previously described. A supply of finely ground, but not pulverized, coffee is then deposited to rest upon the perforated portion 1 or on the filter paper 15 if desired. In general, a tablespoon of very finely ground coffee will be sufficient for the making of the usual size cup of coffee beverage. The combined flow equalizer and vent is now placed in position with its supporting base or foot 9 resting upon the top surface of the leveled supply of coffee. It is desirable that the foot 9 shall present no greater obstructive area to the passage of water into the ground coffee than is necessary to readily support the vent tube on top of the supply. The water required for leaching the aromatic and /or essential ingredients from the ground coffee, having been previously heated to approximately boiling temperature, is now poured slowly into the container 4 and is evenly distributed upon the perforated membar 12, which through its plurality of open ings equalizes the flow ofwater downwardly over substantially the entire mass of the ground coffee. Where air is imprisoned below the water as it spreads over the plate 12, a convenient means of discharge is provided through the opening 7, tube 6 and discharge opening 8. IVhere the discharge of air through the vent is accompanied by an eruption of water, with or without ground coffee mixed therein, the discharged material is returned to the upper surface of the equalizer and I the liquid component again drips To limit the eXtent of through into the space below and eventually into the cup or container 5.

With the use of my improved apparatus, coffee connoisseurs are spared the frequent disappointments occasioned by coffee making processes and devices in which the quality of the productdepends in greater degree upon the skill of the cook. There is no va riable factor in my apparatus or in its mode of operation except the quality of the coffee. In other words, given a uniform quality of coffee used in proper amount, my apparatus produces a uniformly satisfactory coffee beverage to suit the individual taste.

The usual variations in size and details of construction are contemplated in various embodiments to meet different marketing and use conditions without, however, departing from the intended scope of my invention.

I claim:

1. In coffee making apparatus the combination of a container having a perforated bottom wall upon which to support a supply of ground coflee, a combined vent and flow equalizer removably supported on the coffee supply and comprising a tube and a perforated distributing member slidable thereon, said tube having an inlet opening below said member and a discharge opening above said member. 7

2. In coffee making apparatus the combination of a container having a perforated bottom wall upon which to support a supply of ground coffee, a combined vent and flow equalizer removably supportable on the coffee supply and comprising a tube provided with an inlet opening spaced from its lower end, a baffle fixed on said tube above said opening, a collar slidably mounted on the tube above said baffle and a perforated plate spaced above the baffle by said collar and movable therewith in relation to said tube.

3. In coffee making apparatus the combination of a container having aperforated bottom, a flow equalizer comprising a hollow support removably arranged in the container entirely above said perforated bottom wall and a perforated plate slidably mounted on said support for limited up and down movement in relation to vertical Wall portions of the container, said hollow support having an inlet opening below said perforated plate and a discharge opening above said plate to operate as a Vent when water is poured on the plate in making coffee.

4. In coffee making apparatus, the combination of a container comprising a perforated bottom wall for supporting a supply of ground coffee, a bodymember removably positioned on said wall, a flow equalizer removably arranged in the container and including a conduit provided with inlet and outlet openings, a distributor member slidably mounted on said conduitflbetween said openings, and

means for limiting the extent of movement of said distributor member.

5. Cofi'ee making apparatus comprising a bottom member having a perforated central portion, an annular flange arranged in substantially upright relation to said bottom memberand surrounding said centralperforated portion, and a cylindrical glass tube open at both ends and having terminal edge portions adapted to removably and interchangeably rest upon the bottom -member with portions of its exterior surface frictionally engaging interior surfaces of said annular flange. i

6. Coffee making apparatus comprising a bottom member having a perforated central portion, an annular flange arranged in substantially upright relation to said bottom member and surrounding said central perforated portion, a removable filter element supported on the bottom member and covering said perforated portion, and a cylindrical glass tube open at both ends and having end edge portions adapted to interchangeably and removably engage said flange and to present an edge resting upon peripheral portions of said filter element to retain the same in operative position with respect to the perforated centrol portion of the bottom member.

7 A combined venting and flow equalizing device for use with coffee making apparatus comprising an upright hollow stem provided at its upper end with an outlet opening, at its lower end with a laterally extending stem supporting member, and having aninlet opening through alower end portion of its wall above said supporting member, a perforated distributor plate slidably mounted on said stem, and means operatively positioned in relation to the plate and the stem to limit the extent of sliding movement of the plate in both directions on said stem.

In testimony whereof, I have signed my name to this specification this 1st day of July,

1931. a EDWARD A. KOHN.

CERTIFICATE OF CORRECTION.

Patent No. 1,913,398. June 13, 1933.

EDWARD A. KOHN.

It is hereby certified that error appears in the printed specification of the above numbered patent raquiringcurrection as follows: Page 2, line 90, claim 1, for "supported" read "suppertahle"; page 3, line 29, claim 6, fer "centrol" read eentral"; and that the said Letters Patent should he read with these corrections therein that the same may conform to the record of the ease in the Pat ent Office.

Signed and sealed this 22nd day of August, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents. 

